function getAttributeWithKey not found for ConfigurationElement()

In an action, i've got a script that connects to a https end point and pull some data to populate into an input field.

so i'm trying to read configuration elements and get this error

Error in (Dynamic Script Module name : GetListOfGroups#1) TypeError: Cannot find function getAttributeWithKey in object function ConfigurationElement() {

   [native code, arity=0]

Here's my code in the action

System.log("starting")
var username = ConfigurationElement.getAttributeWithKey("wfconf.username").value
var password = ConfigurationElement.getAttributeWithKey("wfconf.password").value
var vendorkey = ConfigurationElement.getAttributeWithKey("wfconf.vendorkey").value

Trying to figure out where i could be going wrong here.